Go to tools>settings and click privacy & security on the left side, scroll down to saved logins. Now click on the 3 small dots at top right of screen and go to options. Here you can choose whether you want to save logins and passwords and whether you want to autofill them or not, and you can click on exceptions if there are just certain websites you do not ever want to save your login. Hope this helps.

Thanks, that is what we did as a short term fix. I really want to stop Firefox from auto-filling on a form and/or recognizing that this form has an input field for username and password (nothing to do with thecurrent user login, but for setting up another potential user).

I have disabled autofill as I like to control whether I want to login or simply want to visit a page. If necessary I use the right-click context menu to fill username and password.

OK, so there is no good way to programatically do this. It must be done by controlling Firefox's options.

Not so good for an application which is designed to be run by anyone (they need to be told).

Thanks for the input.

Final resolution: I changed the field names in the JSP from username and password to alternate names.